The present invention relates to a tire comprising a tire body formed in a ring shape and two ring-shaped retaining rings spaced apart from each other with respect to the width direction on the outer circumferential surface of the tire body, wherein the outer circumferential surface is in contact with the ground The height of the outer circumferential surface being higher than the outer circumferential surface of the fixed portion and being deformed at a portion contacting the ground at the time of deceleration or deceleration, And an expandable and contractible portion which is increased to an increased amount.
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